A uniform board with a weight of 40 N and the applied forces shown in below is in equilibrium. (a) Show all the other forces acting on the board and indicate their direction and magnitude. Explain your answer. (b) Take the axis at O, the position of the fulcrum, and show that the net torque acting on the board is zero. (c) Repeat (b) for an axis about O" at the left end of the board.

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.